Spring and autumn 1956, rock garden and alpine plants, low border, wall and wild plants - Sky-Cleft Gardens,; Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Barre, Vermont, Sky-Cleft Gardens, [1956], 1956)
https://www.biodiversitylibrary.org/bibliography/204862
Keywords: Barre|Catalogs|Nursery stock|Rock plants|Varieties|Vermont|